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Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...
Recorded December 8, 1941. Franklin Delano Roosevelt [a] (January 30, 1882 – April 12, 1945), commonly known by his initials FDR, was an American politician who served as the 32nd president of the United States from 1933 until his death in 1945. The longest serving U.S. president, he is the only president to have served more than two terms.
A glass building facade. Glass is an amorphous ( non-crystalline) solid. Because it is often transparent and chemically inert, glass has found widespread practical, technological, and decorative use in window panes, tableware, and optics. Some common objects made of glass like "a glass" of water, "glasses", and "magnifying glass", are named ...
Numerical aperture versus f-number Numerical aperture of a thin lens. Numerical aperture is not typically used in photography. Instead, the angular aperture of a lens (or an imaging mirror) is expressed by the f-number, written f /N, where N is the f-number given by the ratio of the focal length f to the diameter of the entrance pupil D:
Unless stated otherwise, the properties of fused silica (quartz glass) and germania glass are derived from the SciGlass glass database by forming the arithmetic mean of all the experimental values from different authors (in general more than 10 independent sources for quartz glass and T g of germanium oxide glass). The list is not exhaustive.
Berkemeyer. Glass, 200ml (7 fl. oz.) Australian beer glass (Queensland and Victoria) Handle, 425ml New Zealand beer glass. Jug, 750–1000ml served at pubs in New Zealand. Middy, 285ml (10 fl. oz.) Australian beer glass (New South Wales) Pilsner glass, for pale lager. Pint glass, for an imperial pint of beer or cider.
In statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that quantity. It can refer to the value of a statistic calculated from a sample of data, the value of a parameter for a hypothetical population, or to the equation that operationalizes how statistics or parameters lead to the effect size value.
Vasa Murrhina is a cased glass; the name means vessel of gems. This type of glass has a long history pre dating Fenton. Frank M. Fenton had glass chemist Charles Goe develop a way to make it since the way it was made was long forgotten. The piece starts out as a ball of glass that is rolled in small pieces of broken glass called frit.